package com.mine.webviewtest;

import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @Description: 文件工具类
 * @Author: Wiggins
 * @Date: 2019/2/1 16:45
 */
public class FileUtils {

    /**
     * 根据路径获取bitmap（压缩后）
     *
     * @param srcPath 图片路径
     * @param width   最大宽（压缩完可能会大于这个，这边只是作为大概限制，避免内存溢出）
     * @param height  最大高（压缩完可能会大于这个，这边只是作为大概限制，避免内存溢出）
     * @param size    图片大小，单位kb
     * @return 返回压缩后的bitmap
     */
    public static Bitmap getCompressBitmap(String srcPath, float width, float height, int size) {
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        // 开始读入图片，此时把options.inJustDecodeBounds 设回true了
        newOpts.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(srcPath, newOpts);

        newOpts.inJustDecodeBounds = false;
        int w = newOpts.outWidth;
        int h = newOpts.outHeight;
        int scaleW = (int) (w / width);
        int scaleH = (int) (h / height);
        int scale = scaleW < scaleH ? scaleH : scaleW;
        if (scale <= 1) {
            scale = 1;
        }
        newOpts.inSampleSize = scale;// 设置缩放比例
        // 重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
        Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
        // 压缩好比例大小后再进行质量压缩
        return compressImage(bitmap, size);
    }

    /**
     * 图片质量压缩
     *
     * @param image 传入的bitmap
     * @param size  压缩到多大，单位kb
     * @return 返回压缩完的bitmap
     */
    public static Bitmap compressImage(Bitmap image, int size) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
        int options = 100;
        image.compress(Bitmap.CompressFormat.JPEG, options, baos);
        // 循环判断如果压缩后图片是否大于size,大于继续压缩
        while (baos.toByteArray().length / 1024 > size) {
            // 重置baos即清空baos
            baos.reset();
            // 每次都减少10
            options -= 10;
            // 这里压缩options%，把压缩后的数据存放到baos中
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);
        }
        // 把压缩后的数据baos存放到ByteArrayInputStream中
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
        // 把ByteArrayInputStream数据生成图片
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);
        return bitmap;
    }

    /**
     * bitmap保存为文件
     *
     * @param bm       bitmap
     * @param filePath 文件路径
     * @return 返回保存结果 true：成功，false：失败
     */
    public static boolean saveBitmapToFile(Bitmap bm, String filePath) {
        try {
            File file = new File(filePath);
            file.deleteOnExit();
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
            boolean b = false;
            if (filePath.toLowerCase().endsWith(".png")) {
                b = bm.compress(Bitmap.CompressFormat.PNG, 100, bos);
            } else {
                b = bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
            }
            bos.flush();
            bos.close();
            return b;
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
        }
        return false;
    }


    /**
     * Get a file path from a Uri. This will get the the path for Storage Access
     * Framework Documents, as well as the _data field for the MediaStore and
     * other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri     The Uri to query.
     * @author paulburke
     */
    public static String getPath(final Context context, final Uri uri) {

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }

                // TODO handle non-primary volumes
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[]{
                        split[1]
                };

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {

            // Return the remote address
            if (isGooglePhotosUri(uri))
                return uri.getLastPathSegment();

            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }

    /**
     * *
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context       The context.
     * @param uri           The Uri to query.
     * @param selection     (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    public static String getDataColumn(Context context, Uri uri, String selection,
                                       String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {
                column
        };

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }
}
